Keep in mind that both sides knew well what others were doing: VP Wallace shared white house news, including pre and post Pearl harbor to his BIL, a swiss diplomat, and Nazis had a spy there. Us and Britain were reading all cables between Japan and their negotiators in US, including hard dec 1 deadline and even time of planned delivery of the final note to end negotiations. The only thing that was not there was where exactly attack will happen, although that information existed in other collects
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